Question 1

Chlorine is added to 2 cm3 of a dilute solution of potassium iodide.

The equation for the reaction between chlorine and iodide ions is

Cl2(aq) + 2I-(aq) ➔ I2(aq) + 2Cl-(aq)

Which statement is correct?

  A  

iodide ions oxidise chlorine

  B  

iodide ions reduce chlorine

  C  

chlorine reduces iodide ions

  D  

chlorine is neither oxidised nor reduced

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Question 2

When solid potassium bromide reacts with concentrated sulfuric acid, which substance does not form?

  A  

HBr

  B  

Br2

  C  

SO2

  D  

H2S

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Question 3

Concentrated sulfuric acid is added to separate solid samples of sodium chloride, sodium bromide and sodium iodide.

With which samples does sulfuric acid act as an oxidising agent?

  A  

sodium chloride only

  B  

sodium chloride and sodium bromide

  C  

sodium bromide and sodium iodide

  D  

sodium iodide only

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Question 4

Which statement about the reactions of solid halides with concentrated sulfuric acid is correct?

  A  

chlorides produce HCl as the only gas

  B  

bromides produce HBr, Br2 and H2S

  C  

iodides produce HI, I2 and SO2

  D  

astatides would be expected to produce HAt only

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Question 5

Why do the boiling points of the halogens increase down the group?

  A  

there is an increase in bond enthalpy

  B  

there is an increase in bond polarity

  C  

there is an increase in the strength of instantaneous dipoles

  D  

there is a decrease in electronegativity

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Question 6

Y is a hydrogen halide. It reduces sulfuric(VI) acid to hydrogen sulfide, H2S.

What is Y?

  A  

HF

  B  

HCl

  C  

HBr

  D  

HI

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Question 7

Which statement about the reactions of halogens with halide ions is correct?

  A  

I2(aq) can oxidise Br-(aq)

  B  

Cl2(aq) can reduce Br-(aq)

  C  

Br-(aq) can reduce Cl2(aq)

  D  

Cl-(aq) can oxidise I2(aq)

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Question 8

Which species is not produced by a redox reaction between solid sodium iodide and concentrated sulfuric acid?

  A  

Na2SO4

  B  

H2S

  C  

S

  D  

SO2

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Question 9

Chlorine reacts with cold, dilute, aqueous sodium hydroxide.

Which is a complete list of the products?

  A  

sodium chloride, sodium chlorate(I) and water

  B  

sodium chlorate(I) and water


  C  

sodium chloride, sodium chlorate(V) and water

  D  

sodium chloride and sodium chlorate(I)

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Question 10

Some solid sodium halides are reacted with concentrated sulfuric acid.

Which solid sodium halide does not produce a sulfur-containing gas as one of the products?

  A  

NaCl

  B  

NaBr

  C  

NaI

  D  

NaAt

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Question 11

Which property increases down group 7?

  A  

ability to oxidise a given reducing agent

  B  

boiling point

  C  

electronegativity

  D  

first ionisation energy

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Question 12

Which equation shows a redox reaction that does not occur?

  A  

Br2(aq) + 2KI(aq) ➔ I2(aq) + 2KBr(aq)

  B  

Cl2(g) + 2KI(aq) ➔ I2(aq) + 2KCl(aq)

  C  

Cl2(g) + 2KBr(aq) ➔ Br2(aq) + 2KCl(aq)

  D  

I2(aq) + 2KBr(aq) ➔ Br2(aq) + 2KI(aq)

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Question 13

What is the best oxidising agent?

  A  

F2

  B  

F-

  C  

I2

  D  

I-

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